The Unofficial "Why is this still a thing" Thread

[Reynhart]

Piercing gives nothing to the raid. It gives 5% damage boost to two jobs in particular.

It doesn't matter how it's done, it's still raid utility.

In the meta, with both BRD and MCH, DRG's rDPS outdoes NIN's rDPS, all while DRG still outdoes NIN in pDPS.

Then the problem is not about piercing debuff, but about the native DPS of DRG vs other melee ones. If you have more utility, you shouldn't do more damage by yourself.
For example, if BRD or MCH had the piercing debuff, you'd still take a DRG over a NIN on personal DPS alone and end with the same meta.